Looks a squeeze, 240 swa thoughts.

[LeeH]

Have a 250kW motor with the terminal box in the photo. To me it looks a proper squeeze to bend in the conductors.

Thoughts?

Other options I can think of is allowing the use of SY on this cable only or parallel cables.

 

[SparkyChick]

I have absolutely no experience of cables that big, but if I was asked to do it I might be inclined to do a bit of a switch around, so left cable to right terminals (I'm guessing there is going to be two cables as there are 6 terminals) and vice versa to give myself a bigger bend radius.

Please post up a pick of it when it's done

 

[LeeH]

1 cable, SC. Fed via a VFD.

 

[Pete999]

Have a 250kW motor with the terminal box in the photo. To me it looks a proper squeeze to bend in the conductors.

Thoughts?

Other options I can think of is allowing the use of SY on this cable only or parallel cables.

You try, tri rated conductors.

 

[LeeH]

Cannot get them in Pete, ATEX. Have 2 M75 holes so cannot mod the box.

 

[Pete999]

Cannot get them in Pete, ATEX. Have 2 M75 holes so cannot mod the box.

Where did the 240mm2 SWA calcs come from? that's a big old cable. Ignore please I got my sums wrong

 

[LeeH]

Amtech.

FLC is around 420 IIRC. 30+ run on a ladder in a hot factory.

 

[Pete999]

Amtech.

FLC is around 420 IIRC. 30+ run on a ladder in a hot factory.

Yes without eyes on, it was a daft question,

 

[SparkyChick]

Am I right in thinking with VFDs that it would be a three core cable, with the motor connected in star formation?

Edit:- I'm thinking it may be dependent on the driver itself.

 

[Pete999]

Am I right in thinking with VFDs that it would be a three core cable, with the motor connected in star formation?

Edit:- I'm thinking it may be dependent on the driver itself.

Not sure a motor that size would be started DOL

 

[LeeH]

Am I right in thinking with VFDs that it would be a three core cable, with the motor connected in star formation?

Edit:- I'm thinking it may be dependent on the driver itself.

Yes, a VFD cable should be symmetrically arranged, no 4th core.

1 cable, 3 cores to this motor. 3 if you include the CPC and thyristor cable.

 

[SparkyChick]

Yes, a VFD cable should be symmetrically arranged, no 4th core.

1 cable, 3 cores to this motor.

Thanks

 

[SparkyChick]

Not sure a motor that size would be started DOL

I think the VFD would gradually ramp up the frequency and applied voltage over a pre-programmed period of time or at a pre-programmed rate.

I'm trying to learn abit about VFDs as I've got a sneaky feeling one of the farmers I do a bit of work for has one on the feed mill he's wanting to get connected up, so I'm doing a bit of reading around the subject ahead of the inevitable "it don't work chick, can you come and have a look at it for me"

 

[Lucien Nunes]

Perhaps some combination of angled / cranked lugs, so the near one goes straight, the next one is slightly cranked, then the far one kicks up to the lid of the box at 45° and overflies the first two.

If permissible, an additional pre-formed copper link to offset one of the terminals, or even a flag terminal if a suitable one can be found, could allow one core to go on the outside of the studs.

 

[Pete999]

Could you get an extension box made to give you better accessibility, maybe make it higher, and use angled lugs.